<?php

function addf ($f1, $f2){
	$sum = $f1 + $f2;
	return $sum;
	}


function subf ($f1, $f2){
	$sum = $f1 - $f2;
	return $sum;
	
}function mulf ($f1, $f2){
	$sum = $f1 * $f2;
	return $sum;
	
}function divf ($f1, $f2){
	$sum = $f1 / $f2;
	return $sum;
}


?>